Refrigerant Charge - LG Multi F Series Installation Manual

FINAL INSTALLATION PROCEDURES

Refrigerant Charge

1. Determine the refrigerant that is needed, applying the necessary formulas as outlined in the previous pages.
2. Connect the charging cylinder to the charge hose on the manifold valve.
3. Purge air from the charge hose by opening the valve at the bottom of the cylinder, and press the check valve on the manifold valve.
4. Confirm that the "Lo" knob of the manifold valve is open and charge the system with liquid refrigerant. (Because R-410A is a non-azeo-
trope refrigerant, it must be charged in the liquid state.)
• If the required amount of refrigerant cannot be charged all at once, the refrigerant can be charged a little at a time (approximately 5.29
ounces) while the system operates in cooling. This procedure must be repeated until the entire amount of refrigerant gets charged into
the system; perform once, then wait approximately one [1] minute before resuming.
5. Immediately disconnect the charge hose from the service port on the three-way valve. Stopping halfway allows the refrigerant to
discharge.
• If the system has been charged with liquid refrigerant while it operates, turn the system off before disconnecting the hose.
6. Mount the valve stem nuts and the service port nut. Use torque wrench to tighten the service port nut to a torque of 1.8 kg.m and check
for leaks.
The presence of foreign substances such as air can cause an abnormal pressure rise and will result in explosion and physical injury.
Figure 102: Charging the Refrigerant.
Indoor Unit
Check Valve
Refrigerant
Cylinder
(One)
82
Liquid Piping
Gas Piping
Lo
OPEN
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Open
Three-Way
Valve
Open
Three-Way
Valve
Vacuum
Gauge
F
MULTI
F
MULTI MAX
Outdoor Unit